fix: change in equality, fix in test case for new Queue API

Author: ashokdey

src/_DataStructures_/Queue/index.js

@@ -12,12 +12,12 @@ class Queue extends SinglyLinkedLists {
 
   dequeue() {
     const node = this.removeFromBeginning();
-    return node.data;
+    return node ? node.data : node;
   }
 
   peek() {
     const node = this.getFirst();
-    return node.data;
+    return node ? node.data : node;
   }
 
   length() {

src/_DataStructures_/Queue/weave/index.js

@@ -4,12 +4,12 @@ function weaveQueues(first, second) {
   const weaved = new Queue();
 
   while (first.peek() || second.peek()) {
-    if (first.peek() !== undefined) {
-      weaved.add(first.remove());
+    if (first.peek()) {
+      weaved.enqueue(first.dequeue());
     }
 
-    if (second.peek() !== undefined) {
-      weaved.add(second.remove());
+    if (second.peek()) {
+      weaved.enqueue(second.dequeue());
     }
   }
   return weaved;

src/_DataStructures_/Queue/weave/weave.test.js

@@ -10,18 +10,18 @@ describe('Weave two queues using weaveQueues()', () => {
     const q1 = new Queue();
     const q2 = new Queue();
 
-    q1.add('Hello');
-    q2.add(1);
-    q1.add('World');
-    q2.add(2);
-    q2.add(3);
+    q1.enqueue('Hello');
+    q2.enqueue(1);
+    q1.enqueue('World');
+    q2.enqueue(2);
+    q2.enqueue(3);
 
     const q3 = weaveQueues(q1, q2);
 
-    expect(q3.remove()).toEqual('Hello');
-    expect(q3.remove()).toEqual(1);
-    expect(q3.remove()).toEqual('World');
-    expect(q3.remove()).toEqual(2);
-    expect(q3.remove()).toEqual(3);
+    expect(q3.dequeue()).toEqual('Hello');
+    expect(q3.dequeue()).toEqual(1);
+    expect(q3.dequeue()).toEqual('World');
+    expect(q3.dequeue()).toEqual(2);
+    expect(q3.dequeue()).toEqual(3);
   });
 });